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# Understand the serie! 100 frihbucks!

spinout
3,5,7,9,2,X

What number is X ????? -> explain n get 100frih bucks...

Notice: The serie goes on infinitely and the numbers can be negative and will go negative at a point.

Bonus: When does it go negative? Point out the first number in the serie n get another 50 frihbucks!

Ok, any nutty math-freaks out there??? )

It is a cheapskate nut to crack so come on!
Ghost Rider103
X = 4.

the pattern would be 3,5,7,9,2,4,6,8,-3,-5 and so on.

Correct? Probably not but hey it was worth a shot!
spinout
That was really close!!!!
Sorry X is not 4.

U got 10 frih for trying
Ghost Rider103
Oh well, at least a tried!

Thanks for the 10frih\$ even though I was incorrect.
ocalhoun
 spinout wrote: 3,5,7,9,2,X It is a cheapskate nut to crack so come on!

I've 'cracked' some very difficult examples of these in my day, and this one is not easy.

3,5,7,9,2,3,4,5,1,1,1,1,0,-1,-1,-1,-2,-3,-4,-5,-3,-5,-7,-9,-4,-7,-10,-13

Well, that's my theory, and whether it is the 'correct' one or not, it does work.

Each number is the previous number + (x-1), x is every 4th number, and x steadily decrements, regardless of previous number.
spinout
Gr8 - correct!
It was easy - I told U!
U got frih comming.
ocalhoun
^It wasn't easy!
It took me nearly an hour, spread over two days, to figure it out!

^.^
I really didn't think I had the right one though... I figured it was too complicated to be the real pattern.
spinout
Well my associate at work took 2 minutes to figure it out... But he does series all the time.

http://www.frihost.com/forums/vt-78492.html
have U tried this one????? My workmate didn't even come close!
ocalhoun
^I think there's not really enough there to give enough information though. The only way I can know that x decrements by one, instead of, say, being multiplied by 2/3 is because you said it would go negative.
spinout
I told the negative trend by a reason!
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